:root {
  --ink: #152033;
  --muted: #5c6b82;
  --paper: #f5f7fb;
  --panel: #ffffff;
  --line: #d7e0ee;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-soft: #dbeafe;
  --nav: #10233d;
  --radius: 12px;
  --space: 8px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation: none !important; transition: none !important; }
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--panel);
  font-family: "Noto Sans SC", "IBM Plex Sans", "PingFang SC", sans-serif;
  font-size: 17px;
  line-height: 1.65;
  text-wrap: pretty;
}

img { max-width: 100%; display: block; }
a { color: inherit; }
h1, h2, h3, p { margin: 0; text-wrap: pretty; }

.wrap {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: saturate(1.2);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.brand img {
  width: 36px;
  height: 36px;
  border-radius: 9px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  text-decoration: none;
  color: var(--muted);
  font-size: 15px;
}

.nav-links a:hover { color: var(--ink); }

.nav-cta { display: flex; gap: 10px; align-items: center; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border-radius: 8px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  font-weight: 500;
  font-size: 15px;
  cursor: pointer;
  font-family: inherit;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.btn:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.btn.ghost {
  background: #fff;
  color: var(--ink);
  border-color: var(--line);
}
.btn.ghost:hover { background: var(--paper); }
.btn.wide { width: 100%; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.menu-toggle {
  display: none;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 8px;
  min-width: 44px;
  min-height: 44px;
}

.hero {
  padding: 72px 0 56px;
  background:
    radial-gradient(900px 380px at -8% -20%, #dbeafe 0%, transparent 55%),
    #fff;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 56px;
  align-items: center;
}

.kicker {
  color: var(--accent);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.08em;
  margin-bottom: 14px;
}

.hero h1 {
  font-size: clamp(34px, 4.4vw, 52px);
  line-height: 1.18;
  letter-spacing: -0.03em;
  font-weight: 700;
}

.lead {
  margin-top: 18px;
  color: var(--muted);
  font-size: 18px;
  max-width: 38em;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.hero-note {
  margin-top: 14px;
  color: var(--muted);
  font-size: 14px;
}

.product-shot {
  border: 1px solid var(--line);
  border-radius: 20px;
  overflow: hidden;
  background: #dbeafe;
}

.product-shot img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  aspect-ratio: 16 / 10;
}

.section { padding: 88px 0; }
.section.band { background: var(--paper); }
.section h2 {
  font-size: clamp(26px, 3vw, 36px);
  line-height: 1.25;
  letter-spacing: -0.02em;
}

.section-lead {
  margin-top: 12px;
  color: var(--muted);
  max-width: 40em;
}

.pains {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 36px;
  margin-top: 48px;
}

.pain h3 { font-size: 20px; margin-bottom: 8px; }
.pain p { color: var(--muted); font-size: 15px; }
.pain .arrow {
  display: block;
  margin-top: 14px;
  color: var(--ink);
  font-size: 15px;
  font-weight: 500;
}

.adv-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 20px;
  margin-top: 48px;
}

.adv {
  padding: 28px 28px 26px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.adv.span { grid-column: 1 / -1; display: grid; grid-template-columns: 1fr 1fr; gap: 32px; align-items: center; }
.adv h3 { font-size: 22px; margin-bottom: 10px; }
.adv p { color: var(--muted); font-size: 15px; }
.adv-art {
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--line);
}
.adv-art img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; }

.feat-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 40px;
  margin-top: 48px;
}

.feat h3 { font-size: 22px; margin-bottom: 14px; }
.feat ul {
  margin: 0;
  padding: 0;
  list-style: none;
  color: var(--muted);
}
.feat li {
  padding: 8px 0 8px 18px;
  position: relative;
  font-size: 15px;
}
.feat li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  width: 7px;
  height: 7px;
  border-radius: 99px;
  background: var(--accent);
}

.demo {
  background: var(--nav);
  color: #e8eef8;
  padding: 72px 0;
}
.demo h2 { color: #fff; }
.demo .section-lead { color: #c5d4ea; }
.demo-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
  align-items: end;
  margin-top: 28px;
}
.demo-points { margin: 0; padding: 0; list-style: none; color: #c5d4ea; }
.demo-points li { padding: 6px 0; }
.demo-box {
  background: #163056;
  border: 1px solid #2a4a73;
  border-radius: var(--radius);
  padding: 22px;
}
.demo-box p { color: #c5d4ea; font-size: 14px; margin-bottom: 14px; }
.demo-box strong { color: #fff; font-size: 16px; display: block; margin-bottom: 6px; }

.faq { margin-top: 36px; border-top: 1px solid var(--line); }
.faq details {
  border-bottom: 1px solid var(--line);
  padding: 16px 0;
}
.faq summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 17px;
  list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq details p { margin-top: 10px; color: var(--muted); font-size: 15px; }

.foot {
  padding: 72px 0 28px;
  background: #fff;
  border-top: 1px solid var(--line);
}
.foot-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 48px;
}
.foot h2 { margin-bottom: 12px; }
.foot .about { color: var(--muted); font-size: 15px; }
.form {
  display: grid;
  gap: 12px;
}
.field { display: flex; flex-direction: column; gap: 6px; }
.field label { font-size: 13px; color: var(--muted); }
.field input, .field textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 12px;
  font: inherit;
  color: var(--ink);
  background: #fff;
}
.field input:focus, .field textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.form-msg { font-size: 14px; color: var(--muted); min-height: 1.4em; }
.form-msg.ok { color: #0f9f76; }
.form-msg.err { color: #e11d48; }

.legal {
  margin-top: 40px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

@media (max-width: 860px) {
  .menu-toggle { display: inline-flex; }
  .nav-links, .nav-cta { display: none; }
  .nav.open .nav-links, .nav.open .nav-cta {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    width: 100%;
  }
  .nav.open {
    flex-wrap: wrap;
    padding-bottom: 16px;
  }
  .hero-grid, .pains, .adv-grid, .feat-grid, .demo-grid, .foot-grid, .adv.span {
    grid-template-columns: 1fr;
  }
  .hero { padding-top: 40px; }
  .section { padding: 64px 0; }
}